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Submission #847048

# Submission time Handle Problem Language Result Execution time Memory
847048 2023-09-09T03:37:22 Z math_rabbit_1028 Longest Trip (IOI23_longesttrip) C++17
85 / 100
 14 ms 856 KB 
#include <bits/stdc++.h>
#include "longesttrip.h"
using namespace std;

int find_connected(vector<int> v, vector<int> arr) {
    if (arr.size() == 0 || !are_connected(v, arr)) return -1;

    int s = 0, e = arr.size() - 1;
    while (s < e) {
        int m = (s + e) / 2;
        vector<int> temp;
        for (int i = s; i <= m; i++) temp.push_back(arr[i]);
        if (are_connected(v, temp)) e = m;
        else s = m + 1;
    }
    return arr[s];
}

int find_connected_idx(vector<int> v, vector<int> arr) {
    if (arr.size() == 0 || !are_connected(v, arr)) return -1;

    int s = 0, e = arr.size() - 1;
    while (s < e) {
        int m = (s + e) / 2;
        vector<int> temp;
        for (int i = s; i <= m; i++) temp.push_back(arr[i]);
        if (are_connected(v, temp)) e = m;
        else s = m + 1;
    }
    return s;
}

vector<int> longest_trip(int N, int D) {
    int n = N;
    vector<int> res;

    int ch[256]; for (int i = 0; i < n; i++) ch[i] = 0;
    vector<int> p1, p2;
    p1.push_back(0);
    if (are_connected({0}, {1})) p1.push_back(1);
    else p2.push_back(1);
    for (int i = 2; i < n; i += 2) {
        if (!are_connected({p1.back()}, {i})) swap(p1, p2);
        p1.push_back(i);
        if (i == n - 1) continue;
        if (are_connected({i}, {i + 1})) {
            p1.push_back(i + 1);
            if (p2.size() == 0 || are_connected({i + 1}, {p2.back()})) {
                for (int j = p2.size() - 1; j >= 0; j--) p1.push_back(p2[j]);
                p2.clear();
            }
        }
        else {
            if (p2.size() == 0 || are_connected({i + 1}, {p2.back()})) p2.push_back(i + 1);
            else {
                p1.pop_back();
                p1.push_back(i + 1);
                p2.push_back(i);
            }
        }
    }

    bool connected = false;
    if (p1.size() > 0 && p2.size() > 0) connected = are_connected(p1, p2);
    if (connected) {
        if (p1.size() == 1 || are_connected({p1.front()}, {p1.back()})) {
            if (p2.size() == 1 || are_connected({p2.front()}, {p2.back()})) {
                int a = find_connected_idx(p1, p2);
                int b = find_connected_idx({p2[a]}, p1); //p2[a] - p1[b]
                for (int i = b + 1; i < p1.size(); i++) res.push_back(p1[i]);
                for (int i = 0; i <= b; i++) res.push_back(p1[i]);
                for (int i = a; i < p2.size(); i++) res.push_back(p2[i]);
                for (int i = 0; i < a; i++) res.push_back(p2[i]);
                return res;
            }
        }
        if (are_connected({p1.front()}, {p2.front()})) {
            reverse(p1.begin(), p1.end());
            for (int i = 0; i < p1.size(); i++) res.push_back(p1[i]);
            for (int i = 0; i < p2.size(); i++) res.push_back(p2[i]);
            return res;
        }
        if (are_connected({p1.front()}, {p2.back()})) {
            reverse(p1.begin(), p1.end());
            reverse(p2.begin(), p2.end());
            for (int i = 0; i < p1.size(); i++) res.push_back(p1[i]);
            for (int i = 0; i < p2.size(); i++) res.push_back(p2[i]);
            return res;
        }
        if (are_connected({p1.back()}, {p2.front()})) {
            for (int i = 0; i < p1.size(); i++) res.push_back(p1[i]);
            for (int i = 0; i < p2.size(); i++) res.push_back(p2[i]);
            return res;
        }
        if (are_connected({p1.back()}, {p2.back()})) {
            reverse(p2.begin(), p2.end());
            for (int i = 0; i < p1.size(); i++) res.push_back(p1[i]);
            for (int i = 0; i < p2.size(); i++) res.push_back(p2[i]);
            return res;
        }
    }
    else {
        if (p1.size() > p2.size()) return p1;
        return p2;
    }
    return {}; // never reached
}

Compilation message

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:70:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |                 for (int i = b + 1; i < p1.size(); i++) res.push_back(p1[i]);
      |                                     ~~^~~~~~~~~~~
longesttrip.cpp:72:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |                 for (int i = a; i < p2.size(); i++) res.push_back(p2[i]);
      |                                 ~~^~~~~~~~~~~
longesttrip.cpp:79:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |             for (int i = 0; i < p1.size(); i++) res.push_back(p1[i]);
      |                             ~~^~~~~~~~~~~
longesttrip.cpp:80:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |             for (int i = 0; i < p2.size(); i++) res.push_back(p2[i]);
      |                             ~~^~~~~~~~~~~
longesttrip.cpp:86:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |             for (int i = 0; i < p1.size(); i++) res.push_back(p1[i]);
      |                             ~~^~~~~~~~~~~
longesttrip.cpp:87:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |             for (int i = 0; i < p2.size(); i++) res.push_back(p2[i]);
      |                             ~~^~~~~~~~~~~
longesttrip.cpp:91:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |             for (int i = 0; i < p1.size(); i++) res.push_back(p1[i]);
      |                             ~~^~~~~~~~~~~
longesttrip.cpp:92:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |             for (int i = 0; i < p2.size(); i++) res.push_back(p2[i]);
      |                             ~~^~~~~~~~~~~
longesttrip.cpp:97:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   97 |             for (int i = 0; i < p1.size(); i++) res.push_back(p1[i]);
      |                             ~~^~~~~~~~~~~
longesttrip.cpp:98:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |             for (int i = 0; i < p2.size(); i++) res.push_back(p2[i]);
      |                             ~~^~~~~~~~~~~
longesttrip.cpp:37:9: warning: variable 'ch' set but not used [-Wunused-but-set-variable]
   37 |     int ch[256]; for (int i = 0; i < n; i++) ch[i] = 0;
      |         ^~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 2 ms 344 KB Output is correct

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 344 KB Output is correct
2 Correct 5 ms 344 KB Output is correct
3 Correct 4 ms 344 KB Output is correct
4 Correct 4 ms 344 KB Output is correct
5 Correct 5 ms 344 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 344 KB Output is correct
2 Correct 4 ms 344 KB Output is correct
3 Correct 4 ms 344 KB Output is correct
4 Correct 4 ms 344 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Correct 10 ms 344 KB Output is correct
7 Correct 5 ms 344 KB Output is correct
8 Correct 4 ms 344 KB Output is correct
9 Correct 5 ms 344 KB Output is correct
10 Correct 5 ms 600 KB Output is correct
11 Correct 5 ms 600 KB Output is correct
12 Correct 5 ms 600 KB Output is correct
13 Correct 5 ms 344 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 344 KB Output is correct
2 Correct 5 ms 344 KB Output is correct
3 Correct 4 ms 344 KB Output is correct
4 Correct 4 ms 344 KB Output is correct
5 Correct 6 ms 344 KB Output is correct
6 Correct 14 ms 344 KB Output is correct
7 Correct 5 ms 344 KB Output is correct
8 Correct 4 ms 344 KB Output is correct
9 Correct 4 ms 344 KB Output is correct
10 Correct 4 ms 344 KB Output is correct
11 Correct 5 ms 344 KB Output is correct
12 Correct 4 ms 344 KB Output is correct
13 Correct 5 ms 344 KB Output is correct
14 Correct 8 ms 344 KB Output is correct
15 Correct 8 ms 344 KB Output is correct
16 Correct 7 ms 344 KB Output is correct
17 Correct 6 ms 344 KB Output is correct
18 Correct 6 ms 344 KB Output is correct
19 Correct 6 ms 436 KB Output is correct
20 Correct 5 ms 344 KB Output is correct
21 Correct 6 ms 344 KB Output is correct
22 Correct 6 ms 340 KB Output is correct
23 Correct 6 ms 440 KB Output is correct
24 Correct 5 ms 600 KB Output is correct
25 Correct 7 ms 344 KB Output is correct
26 Correct 7 ms 344 KB Output is correct
27 Correct 7 ms 344 KB Output is correct
28 Correct 6 ms 344 KB Output is correct
29 Correct 7 ms 344 KB Output is correct
30 Correct 7 ms 344 KB Output is correct
31 Correct 8 ms 596 KB Output is correct
32 Correct 6 ms 344 KB Output is correct
33 Correct 6 ms 344 KB Output is correct
34 Correct 7 ms 344 KB Output is correct
35 Correct 7 ms 344 KB Output is correct
36 Correct 5 ms 600 KB Output is correct
37 Correct 6 ms 344 KB Output is correct
38 Correct 8 ms 344 KB Output is correct
39 Correct 9 ms 436 KB Output is correct
40 Correct 7 ms 344 KB Output is correct
41 Correct 7 ms 852 KB Output is correct
42 Correct 8 ms 344 KB Output is correct
43 Correct 7 ms 600 KB Output is correct
44 Correct 8 ms 600 KB Output is correct
45 Correct 9 ms 344 KB Output is correct
46 Correct 13 ms 344 KB Output is correct
47 Correct 9 ms 344 KB Output is correct
48 Correct 7 ms 344 KB Output is correct
49 Correct 8 ms 344 KB Output is correct
50 Correct 6 ms 432 KB Output is correct
51 Correct 8 ms 436 KB Output is correct
52 Correct 9 ms 344 KB Output is correct
53 Correct 6 ms 344 KB Output is correct
54 Correct 7 ms 344 KB Output is correct
55 Correct 7 ms 344 KB Output is correct
56 Correct 5 ms 436 KB Output is correct
57 Correct 7 ms 436 KB Output is correct
58 Correct 7 ms 600 KB Output is correct
59 Correct 7 ms 600 KB Output is correct
60 Correct 8 ms 604 KB Output is correct
61 Correct 7 ms 344 KB Output is correct
62 Correct 7 ms 444 KB Output is correct
63 Correct 8 ms 604 KB Output is correct
64 Correct 11 ms 856 KB Output is correct

Subtask #4
45.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 344 KB Output is correct
2 Correct 5 ms 344 KB Output is correct
3 Correct 4 ms 344 KB Output is correct
4 Correct 6 ms 344 KB Output is correct
5 Correct 5 ms 600 KB Output is correct
6 Correct 11 ms 344 KB Output is correct
7 Correct 5 ms 344 KB Output is correct
8 Correct 4 ms 344 KB Output is correct
9 Correct 5 ms 344 KB Output is correct
10 Correct 4 ms 600 KB Output is correct
11 Correct 4 ms 344 KB Output is correct
12 Correct 4 ms 344 KB Output is correct
13 Correct 4 ms 344 KB Output is correct
14 Correct 6 ms 344 KB Output is correct
15 Correct 7 ms 436 KB Output is correct
16 Correct 7 ms 344 KB Output is correct
17 Correct 6 ms 344 KB Output is correct
18 Correct 6 ms 344 KB Output is correct
19 Correct 5 ms 344 KB Output is correct
20 Correct 6 ms 344 KB Output is correct
21 Correct 8 ms 344 KB Output is correct
22 Correct 7 ms 344 KB Output is correct
23 Correct 8 ms 344 KB Output is correct
24 Correct 7 ms 344 KB Output is correct
25 Correct 6 ms 344 KB Output is correct
26 Correct 6 ms 344 KB Output is correct
27 Correct 7 ms 344 KB Output is correct
28 Correct 6 ms 344 KB Output is correct
29 Correct 6 ms 344 KB Output is correct
30 Correct 6 ms 344 KB Output is correct
31 Correct 6 ms 344 KB Output is correct
32 Correct 9 ms 344 KB Output is correct
33 Correct 10 ms 344 KB Output is correct
34 Correct 8 ms 344 KB Output is correct
35 Correct 9 ms 344 KB Output is correct
36 Correct 7 ms 344 KB Output is correct
37 Correct 6 ms 432 KB Output is correct
38 Correct 7 ms 432 KB Output is correct
39 Correct 7 ms 344 KB Output is correct
40 Correct 6 ms 344 KB Output is correct
41 Correct 7 ms 344 KB Output is correct
42 Correct 7 ms 344 KB Output is correct
43 Correct 6 ms 600 KB Output is correct
44 Correct 6 ms 344 KB Output is correct
45 Correct 6 ms 436 KB Output is correct
46 Correct 6 ms 604 KB Output is correct
47 Correct 7 ms 344 KB Output is correct
48 Correct 7 ms 600 KB Output is correct
49 Correct 8 ms 344 KB Output is correct
50 Correct 9 ms 344 KB Output is correct
51 Correct 7 ms 600 KB Output is correct
52 Correct 6 ms 344 KB Output is correct
53 Correct 7 ms 344 KB Output is correct
54 Correct 6 ms 344 KB Output is correct
55 Correct 6 ms 344 KB Output is correct
56 Correct 6 ms 600 KB Output is correct
57 Correct 7 ms 600 KB Output is correct
58 Correct 7 ms 600 KB Output is correct
59 Correct 8 ms 344 KB Output is correct
60 Correct 7 ms 596 KB Output is correct
61 Correct 7 ms 344 KB Output is correct
62 Correct 7 ms 688 KB Output is correct
63 Correct 7 ms 600 KB Output is correct
64 Partially correct 9 ms 856 KB Output is partially correct
65 Partially correct 8 ms 600 KB Output is partially correct
66 Partially correct 7 ms 440 KB Output is partially correct
67 Partially correct 9 ms 344 KB Output is partially correct
68 Partially correct 7 ms 592 KB Output is partially correct
69 Partially correct 8 ms 440 KB Output is partially correct
70 Partially correct 8 ms 440 KB Output is partially correct
71 Correct 7 ms 444 KB Output is correct
72 Correct 8 ms 600 KB Output is correct
73 Partially correct 8 ms 440 KB Output is partially correct
74 Partially correct 7 ms 856 KB Output is partially correct
75 Partially correct 8 ms 608 KB Output is partially correct
76 Correct 8 ms 344 KB Output is correct
77 Correct 7 ms 600 KB Output is correct
78 Partially correct 8 ms 432 KB Output is partially correct
79 Partially correct 8 ms 688 KB Output is partially correct
80 Partially correct 7 ms 604 KB Output is partially correct
81 Partially correct 7 ms 344 KB Output is partially correct
82 Partially correct 8 ms 344 KB Output is partially correct